You'll need a friend or some place to mount the smartphone to shoot the video as you practice.

The Blast Basketball Replay is a sensor that measures metrics as you practice jump shots, layups and dunks. The sensor clips to the back of your shorts where it records four metrics important to jumping: vertical height, rotation, jump acceleration and hang time. The app includes videos about each metric, information on why it’s important, and drills to improve your numbers. The sensor syncs with your smartphone, which takes video of your jumps using motion-capture technology so you can view your form in slow motion with metrics overlaid on the video. The app stores 1,000 video clips, or "actions,” and includes a share feature so you can send them to social media.

One negative that I’m sure they will soon take care of is that Blast currently only works on Apple Software and Operating Systems. So, you c…

One negative that I’m sure they will soon take care of is that Blast currently only works on Apple Software and Operating Systems. So, you can’t currently use this product on any Android platforms. However, the App is easy to maneuver and operate.